BMA Signal Assistant Engineer (Computer) Exam: 2021 (BUET) | প্রশ্ন ও সমাধান

Written question 1Networking

Define IP 127.0.0.1, what is localhost?

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Written question 2Networking

What is static IP Address and dynamic IP Address?

Model answer

An IP address can be assigned to a host in two ways:

Static IP address: manually configured, permanent, and never changes unless an administrator changes it. The ISP or network admin reserves it exclusively for that device.
Dynamic IP address: automatically leased to a device for a limited time by a DHCP server (or via PPPoE); when the lease expires or the device disconnects, the address can be reassigned to another device.

Aspect	Static IP	Dynamic IP
Assignment	Manual, by admin/ISP	Automatic, by DHCP server
Persistence	Permanent, fixed	Temporary, can change on renewal
Cost	Usually costs extra	Usually free/default
Best for	Servers, VoIP, remote access, hosting	Ordinary client devices (phones, laptops)
Management overhead	High (manual tracking)	Low (self-managing)
Example use	Web server, mail server, DNS server	Home Wi-Fi client, guest device

Worked context: a company's public web server is given a static IP (say 203.0.113.10) so its DNS A record always resolves correctly; the office's laptops instead pull a dynamic IP like 192.168.1.45 from the router's DHCP pool, which may be reused by another laptop the next day.

Exam takeaway: static = fixed & manual (needed when others must always find you at the same address); dynamic = automatic & temporary (efficient for ordinary end-user devices).

Written question 3Programming

Write a simple output C program to check odd-even number.

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Written question 4Data Structures

Making binary a tree from the given expression: 3 + ((5+9)*2)

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Written question 5Programming

Write a C program for prime numbers between 1 to N.

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Written question 6Networking

Difference between IPv4 and IPv6

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Written question 7Digital Logic

Make NAND gate using NOR gate.

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Written question 8Networking

Difference between Switch, Hub and Router.

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Written question 9Mathematics

Find the Value of I.

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Written question 10Mathematics

Find the Value of I_ab using Norton's Theorem.

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